Though he achieved fame in his lifetime as the author of Utopia and won the respect of the young Henry VIII, without his daughter, Margaret Roper, Thomas More would be a mere footnote in history. It was she who enabled him to enact posthumous revenge on the king who sent him to the gallows for refusing to condone his marriage to Anne Boleyn. Margaret's masterstroke was to compile her father's letters, written while he awaited death in a dank cell in the Tower of London, which cemented her father's reputation as a man of conscience felled by a tyrannous king. In this original and engaging double biography, John Guy charts the debt that history owes to More's enduringly obedient daughter.